I always I try to pitch my videos at a level where I build upon the basics so that most people can follow what I am doing, even though the subjects can be quite technical, It never entered my head that some people new to the technology belived that Auto Focus meant that the machine (just like an auto focus camera) was capable of setting the correct focus come what may. With such a concept in mind they were happy to buy an "intelligent" laser machine.
From correspondence received in recent months, there have been seval that misunderstood what they were buying and their limited knowledge of lenses has caused futher bewiderment.
It is with this group of people in mind that I revive a subject first tackled 4 years ago. This time I have changed the emphasis to be more all encompassing.
